June 2024
Intermediate to advanced
200 pages
4h 46m
Japanese
Content preview from Python2年生 データ分析のしくみ 第2版 体験してわかる！会話でまなべる！
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Chapter
6
182
相関行列を色の熱さで表現する：ヒートマップ
相関係数のすべての組み合わせを調べるとき、「相関行列」で表示させると一度に見える
ので便利です（リスト
6.7）。
print(df.corr())
22
LESSON
「ヒートマップ」と「散布図行列」について見てみましょう。
総当たりで表示させる
散布図
さっきの例では、数学・理科・社会の
3
つだったけど、数がもっと増え
てくると大変になってくるね。
どこまであるんだ。ライブラリ！
組み合わせが増えるから大変だ。でもそういうときも、便利な機能が
ライブラリにはあるよ。「相関行列を色の熱さで表現する機能」や「 散
布図を総当たりで表示させる機能」だ 。
【入力プログラム】リスト 6.7
183
総当たりで表示させる散布図
LESSON
22
数学 理科 社会
数学
1.000000 0.968843 0.394252
理科 0.968843 1.000000 0.413466
社会 0.394252 0.413466 1.000000
一度に見えるので便利なのですが、それでも数字がたくさんあるとパッと見ただけでは
わかりません。そこで、それぞれの値に色を付けてわかりやすくする方法があります。そ
れが「ヒートマップ」です。「大きい値を熱そうな色」「 小さい値を冷たそうな色 ...
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